Carburetor



'OGL 11 1932 F'. H. HEITGER 1,881,561

- CARBURETOR Filed July 25. 1928 2 Sheets-Sheet l Oct. 11, 1932. F Hf HE|TGER i .1,881,561

l CARBURETOR Filed July 23, 1928 2 Sheets-Sheet Patented Oct. 11i, 11932 i FRANK'H. HEITGER, 0FY FLINT, MICHIGAN f `(maisunieron Application led July 23, 1,928. Serial No. 294,917.

* This invention relatesV toV improvements in carburetors of the 4kind 'used on internal combustion motors in automotive vehicles.`

The inventionpertains tojplain tube or Venturi type carburetorsof the kind rusing 'an auxiliary fuel reservoir or well,'and especially to such carburetors having variable level auxiliary fuel reservoirsV containing Van auxiliary fuelsupply, that at thelowest speeds is to bevdrawn upon as the occasion requires, such asfor acceleration purposes when open-` ing the l.throttle from lowest speed position, when* ankk auxiliary or abnormal supply `of liquid fuel isneeded to compensate for the sudden vinrush .of air into ythe carburetor.4

Such reservoirs have a vent or port above the static level,fin orderthat atmospheric pressure may force lthe fuelout to the air-passage` way'of the carburetor.

""Oneof the primary yobjects of .the present invention is to combine withlsuch auxiliary fuel feeding means, a device for preventing the flow ofair throughv the auxiliary'reservoir to the air conduit of the carburetor.

Another object is to combine with the auxiliarylreservoir, aV float operated valve designedto close the atmospheric vent or port of the auxiliary reservoir when the 4fuel level descends vin the latter, .in order-to preventthe feedof air with the auxiliary fuel. Another objectgco-related to the above, is the provision ofmeans to continue the `feed of fuel into` and vthrough the auxiliary reservoir while the atmospheric vent is closed;y

' Other objects and advantages ofthe invention will in part'beV set forth while specify- Y ing the various features of construction and loperation hereinafter contained.

. VReferring to the drawings hereto annexed, for a detailed description of the invention, -f Fig.V 1, is a vertical sectional view partly in elevation of one type of -carburetor to which the invention maybe applied.

Fig. -2,\is a top Vplan view of a detail of the carburetor with certain parts -omitted toV facilitate illustration and showing the 'mea-ns for feeding fuel from the constant level supply reservoir to the auxiliary well.

Fig.- Sisa'verticalsectional view taken on line 3 8 of Fig. 2. f f

` Fig. 1 is a horizontal sectional view taken on line 4-4 of Fig. 3.

At the outset of this detail description it may be stated that the present invention can be applied to many types of carburetors,and

`forthe purpose of disclosing the invention I have shown the same applied to a double Yeni-uri type carburetor having a heated rlser.

In the drawings 1 denotes the main air intake of the carburetor provided with a choke valve 2, which may be of the ther1nostatic` controlled type. 3 designates the main fuel nozzle which discharges into an inner venturi 4, the air entering the latter at its lower end 5. The mixtureof fuel and air formed in the inner venturi is discharged into the larger venturi 6 and there mixed with additional air which enters thelower end of the larger venturi. As before stated,

this particular type of carburetor has a riser 7, which contains the pivoted throttle yvalve 8 and a heated'iiuid may enter this riser at the point 9, and be discharged at 10, the flow being controlled by a valve 11 that may be controlled thermostatically by means not shown.

The carburetor includes an idling jet or nozzle 12 which at certain positions of the throttle, feeds fuel into an idling duct 13 that discharges at 14 into the mixture passageway 15; it being understood that the mixture travels from 15 to the intake manifold of the engine. y

16 indicates a constant level reservoir or flow chamber from which the fuel flows to the main and auxiliary nozzles and in traveling to the main nozzle it passes through a measuring jet or orice member 17 into a chamber 18 which communicates with the main nozzle.

The auxiliary fuel fed to the main nozzle travels through a'conduit 19 from (see Figs. 2 and 8) an auxiliary well 20, and also through 19 to the auxiliary reservoir in filling the latter. Y f v This auxiliary well has a port 21 through which the auxiliary fuel iiows from the well lto the conduit 19, and the auxiliary well ris fed by a pipe 22 which places the same in cornniun'ication With the constant level fuelu supply 16, and is arranged below the nornial t fuel line A'-A as shovvnin Fig. 3.'

The reservoir is provided Vvvitli aV cap' y formed of two screw-threaded yInernlbers 23 and 24, the latter having threaded engageg ment with fthe'zreservoir'and the Yformer having threaded engagement -Witlgthe-paft The part 23 includes a chamber 25 1n Which valve 26 moves, this valve being inounted I on a stem 27 attached toafloat 28VV lvvhieh' is provided 'at its lower end with a guidevplate y*2Q-(see Fig. l) having'peripheral lugsjSO, Whichzengage the inner. surface ,of` y.the `Well.

and serve to guide the Heat. "lhev chanilee' communicates with atmosphere' through'A the port 31 and the chamber-25communicates i. with the `Chamber 32 of the Wellby means of aport 3:3-, which when the float is ,in its lowermest position vis closed by the4 valve 26.' l

' When the engine "isfnotrunning, the,y fuel ,freni thelnjain'l reservoir or constant levelA Sup-ply ,16 uil-L1 lewethroue'h the rassteemys 22 vand 19 fand iillthe main nozzle and-aux#V ilfi ary Well to ,the level 5L-,FA Aand at sueh time i yethefloat due to the v-fuelii-i theV chamber y32.Y

^ will; oocupyfthe lpositionr-shoyvn in Fig. V3

' with' the valvel26 bearing against the vundery side ofthe hea'dfef the Cap member-23.@ At this. time; ,it may be Stated', that the adjust nient pf thecap inemleer231will permitgreati-V` Y ergordess Vz'ertigll-nf'loveinent ofthe fleet and Y. l Infoperation, as soon as fthel engine started and 'sueent' suctienfs ;ebtanefl en the Yeutlet end efthejnozzle 3, -fuelwifll he dis- "charged therefromfand-as, the @meningv in measuring jet 'lffuel will ghe drawn from. i thegauXiliary Well.,V Asthe level'of Afuel in Well-2O drops by discharge `from thenozzle I3, the valve 26Will vclose port 33and-eonf tinued suctionthrough portgQfl by centinu'ed inerease in rnotor speed, -wifllfna'llyfcause subfatniospheric,pressure in ythe Well A20, kand i] seme fuel vrna'y gbegfedfatsuch time through 22,3-2fand-21*to'thenozzle 3. YT-liis feed *is desirable i-nyseme eases. Asgthe portf2lfis falsure establishedin the Wel-fl after itY is empty and-this sub-atmosphericpressure, When :the

throttle Vis:,elosefd,suddenly..draws fuel back into vthe Wel l-.;owingto lthe then-.difference in pressure: atthe nozzle outlet and in Vrthe vvell. Tlrisfuel Willactfonthe float 28land-liftthe same, unseating valve 26 and allow-the 'level v AfAf-telagain be attained in ytl-iewell. It is understood, `of1course,fthat the valve 26 and rtsi-port,Y 33e-erase formed nas to lee air tight, .the ySucteri Verithis valve, as `lstated, tendingvv to seat ittighter, thegreater lthe suction;

A While guiding tlre. float, iper-InittheA Y lgiquid-fuelvto-flowpast ther'float'V Vvvhe-n Yneces#V Y throttle.

71,881,561"V i' i From .the foregoing it inay he seen that have `provided novelmechanisml in which means are combined with an auxiliary fuel reservoir to prevent its feedingor bleedingV air to the fuel feed Whilejrstill retaining an auxiliary fuel feeding or supply means as for acceleration and '.F'rorn'theaheveit `believed that the con# struction, operation, and advantages of the invention'niay bel-readily understood by those skilled in the art and itis obvious that theY `pa'rtsorV elements may .be arranged in various,V positions. andv be' made in various VWays 'vvitl'iut departing Xfrom-the spirit of the invention `assetfforth in the claims.Vv

means', for feeding; fuelileret@ illGlildilg "a Constant level fuel reservoir, ani auxiliary variable; level fuel Well suppliedlbyfthe Y.resa

ervoir, said Well having -airinlet means and fuel outlet means, thefuel'outletineans coininunicating with theair conduit, -andneans functioning upon a drap llevevlef the ffuel inthlewell for closing-said airfinlletlrmeans. fr 2. Inl a carburetor -haveinggja carbureti'ng passage, meanserfeeding -iuelctheretof-frm va' consta-nt level -lfuelj'resergvofirIley;` gravityA from k:a Vrestricted :passageandnormallyfsubi jeotedto atinespliericjpressure,l janv vauxiliary variable Ylevel reserveir vreceivingfuell-@frein saidvr constant level* reserviei'rl bly gravity throughV a restrictedzpassage,'said 'auxiliary reservoir having'- Ja-n outlet for `augrnentirngi;

'the supplyof-fuel to the carburetingfpassage andV jarnfair inlet a`nd 'rneans control-led -by the level of f fuel .v in 'saidy `faufxijlianyj yreservoir ferY closingk and openingv said fair vinlet?Y V3. vIn Ya carburetor Vhaving gangairjeeliduit,

' agconstantllevel :reservoir having. means for outlet fof said auxiliary rreservoiri cdmniu'niatlngfrvvith saidyair l@enduitfor'augmenting the fuel suppliedto saideonduiura 'loatY in e said vauailiaryreservoir?, a5 stem .fion said float and a'valve-on the stemteclosetheair inlet inthe reservoirdrops. Y j Y ofv said auxiliary reservoir "Whenthe fnellevel Vlovv speeds Withvvide open vlill] 5. In a carburetor having an air conduit, a constant level reservoir for feeding fuel to said conduit, an auxiliary reservoir receiving fuel from said constant level reservoir for'v supplying fuel to said air conduit, said aux; iliary reservoir having a `cap provided with a'chamber, an air inlet port and fuel outlet port for said chamber, a float in said aux-2 iliary reservoiiand a valve in said eha'mbei movable with the float and designed lt close Athe air'inlet port of said chamber' when the lloat descends.

In testimony whereof I hereunto aiix my saV 

